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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. See the documentation for help with subscribing to or submitting Circulars.

Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
Advanced Search

To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.

Advanced Search Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

31741 results found.

  1. IPN Summary of SGR1806-20 Activity in 2004
  2. GRB040511: Retraction of redshift identification
  3. SGR 1806-20: no IR variability of the proposed counterparts
  4. MASTER:HETE Alert 3259 (SRG1806-20) optical observation
  5. Activivty of SGR 1806-20
  6. GRB 040511, very fast decay?
  7. GRB 030324: Detection and Color of Host Galaxy
  8. GRB 040511: NIR observations with REM
  9. GRB040511: Redshift identifcation
  10. GRB 040511: Optical limit
  11. GRB040511: Candidate optical/NIR afterglow
  12. GRB 040511: ROTSE-III Rapid Optical Upper Limits
  13. GRB 040511: Second Epoch Optical Observations
  14. GRB 040511: Optical observations
  15. GRB 040511: Optical Observations
  16. GRB040511: Optical Observations
  17. GRB040511: Optical Observations
  18. GRB and XRF on April 27, 2004. Detection by Konus-Wind and Helicon (Coronas-F)
  19. IPN triangulation of GRB040425 (=H3183)
  20. On Line Availability of Archival HETE Fregate Data and Lightcurves
  21. GRB040422, optical observations at Loiano
  22. GRB 040422: ROTSE-IIIb Prompt Optical Limits
  23. GRB040422, BVRcIc field calibration
  24. GRB040422: optical and NIR observations at the VLT
  25. GRB 040403, deep optical observations
  26. HETE/IPN localization of GRB040403A (=H3143, a long burst) and GRB040403B(=H3144, a short/hard burst)
  27. GRB 040403: Optical Observations
  28. GRB 040403 Optical Observations
  29. GRB 040403: Optical observations
  30. GRB 040403: optical observations
  31. GRB 040403: Optical Observations
  32. Summary of recent bursts from SGR 1806-20 detected by INTEGRAL
  33. GRB040323: NIR Observations and Variable Object
  34. GRB 040319 (=H3128): An X-Ray-Rich GRB Localized by the HETE-2 WXM and SXC
  35. GRB 040323, a dark GRB ?
  36. GRB040223: Deep NIR NTT data re-analysis
  37. GRB 040223: XMM-Newton results
  38. GRB040223, improved XMM position
  39. GRB 031203: spectoscopic evidence for a 1998bw-like SN
  40. GRB 031203, possible supernova
  41. IBAS results on a burst from SGR1806-20
  42. GRB 040228 Optical observations
  43. IPN triangulation of GRB040228 (H3066, H3067)
  44. GRB 040228 (=H3066?,=H3067?): A Long GRB Localized by the HETE-2 WXM
  45. GRB 040223: Deep NIR NTT observations
  46. GRB 040223 : Optical observation (non-detection)
  47. XMM-Newton Images of GRB 040223
  48. GRB 040223, VLA observations
  49. GRB 040223: REM IJK Observations
  50. GRB 040223 XMM-Newton observation ...
  51. GRB 031203 XMM-Newton observation
  52. GRB031111, optical observations
  53. GRB031220: 2nd Chandra observation and X-ray afterglow candidate
  54. GRB031203: Chandra Observations
  55. GRB040106, follow-up radio observations
  56. GRB040106: refined X-ray transient position
  57. Follow-up on IBAS GRB Alert 1379
  58. SN 2003dh/GRB030329 late-time optical spectroscopy
  59. GRB040106, Radio Observations
  60. GRB040106, likely optical afterglow
  61. GRB040106: Second Epoch Optical Observations
  62. GRB 031220: Optical observations of Chandra X-ray sources
  63. XMM-Newton Images of GRB 040106
  64. GRB040106: optical observations with REM+ROSS
  65. GRB031220: observation at Univercity of Miyazaki
  66. GRB 040106: Optical observations
  67. XMM-Newton observation of GRB040106
  68. GRB031220(=H2976): TNG R-band Observation of the Chandra X-ray Sources
  69. GRB031220(=H2976): Observation with the Chandra X-ray Observatory
  70. GRB 031203 I-band monitoring
  71. IPN triangulation of GRB031214 (short/hard; very intense; small error box)
  72. GRB 2974 follow-up observations
  73. GRB031203, improved XMM position
  74. GRB 031203: SMARTS optical monitoring
  75. GRB 021203: A Normal GRB viewed far off axis?
  76. GRB 031203: Variable Radio Source
  77. GRB 031203: Magellan spectrum of possible GRB host
  78. GRB 031203: Optical/IR Astrometry
  79. GRB031203 K prime photometry: correction to galaxy coordinates
  80. GRB031203: ROSAT upper limits suggest XMM-S1 source as the transient
  81. XMM-Newton Observation of GRB031203
  82. GRB031203: K' Photometry of the likely GRB host
  83. XMM-Newton Observation of GRB031203
  84. GRB 031203: Radio detection
  85. GRB 031203: Further reports on December 4 observations
  86. GRB 031203: IR NTTobservations do not confirm REM detection
  87. GRB 031203: z ~ 10 or Fragmented Dust in the Circumburst Environment?
  88. GRB 031203: Apparent Spectral Break
  89. GRB031203: Planned XMM-Newton observation II
  90. GRB 031203: IR REM Observations
  91. GRB031203: Optical Observations
  92. GRB 031203 XMM-Newton observation
  93. GRB 031203: Optical/IR SMARTS Observations
  94. GRB031203: Planned XMM-Newton observation
  95. GRB031111A, prompt optical observations
  96. GRB 031111, Radio observations
  97. GRB 031111: Optical observations
  98. GRB 031111, optical observations
  99. SN 2003jd (SN/GRB?) -- X-ray Observations
  100. IPN triangulation of GRB031111 (=H2924): small error box

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